export default function getPreMonth(date) {  
	var arr = date.split('-');  
	var year = arr[0]; //获取当前日期的年份  
	var month = arr[1]; //获取当前日期的月份  
	var day = arr[2]; //获取当前日期的日  
	var days = new Date(year, month, 0);  
	days = days.getDate(); //获取当前日期中月的天数  
	var year2 = year;  
	var month2 = parseInt(month) - 1;  
	if (month2 == 0) {  
		year2 = parseInt(year2) - 1;  
		month2 = 12;  
	}  
	var day2 = day;  
	var days2 = new Date(year2, month2, 0);  
	days2 = days2.getDate();  
	if (day2 > days2) {  
		day2 = days2;  
	}  
	if (month2 < 10) {  
		month2 = '0' + month2;  
	}  
	var t2 = year2 + '-' + month2 + '-' + day2;  
	return t2;  
}
